/**
 * 数字金额 转 大写金额
 * @param currencyDigits
 * @returns {string}
 */
function convertCurrency(currencyDigits) {
// Constants:
    var MAXIMUM_NUMBER = 99999999999.99;
    // Predefine the radix characters and currency symbols for output:
    var CN_ZERO = "零";
    var CN_ONE = "壹";
    var CN_TWO = "贰";
    var CN_THREE = "叁";
    var CN_FOUR = "肆";
    var CN_FIVE = "伍";
    var CN_SIX = "陆";
    var CN_SEVEN = "柒";
    var CN_EIGHT = "捌";
    var CN_NINE = "玖";
    var CN_TEN = "拾";
    var CN_HUNDRED = "佰";
    var CN_THOUSAND = "仟";
    var CN_TEN_THOUSAND = "万";
    var CN_HUNDRED_MILLION = "亿";
    var CN_SYMBOL = "";//人民币
    var CN_DOLLAR = "元";
    var CN_TEN_CENT = "角";
    var CN_CENT = "分";
    var CN_INTEGER = "整";
    // Variables:
    var integral; // Represent integral part of digit number.
    var decimal; // Represent decimal part of digit number.
    var outputCharacters; // The output result.
    var parts;
    var digits, radices, bigRadices, decimals;
    var zeroCount;
    var i, p, d;
    var quotient, modulus;
    // Validate input string:
    currencyDigits = currencyDigits.toString();
    if (currencyDigits == "") {
        return "还没有输入数字！";
    }
    if (currencyDigits.match(/[^,.\d]/) != null) {
        return "请输入有效数字!";
    }
    if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
        return "请输入有效格式数字！";
    }
    // Normalize the format of input digits:
    currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.
    currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.
    // Assert the number is not greater than the maximum number.
    if (Number(currencyDigits) > MAXIMUM_NUMBER) {
        return "您输入的数字太大了!";
    }
    // Process the coversion from currency digits to characters:
    // Separate integral and decimal parts before processing coversion:
    parts = currencyDigits.split(".");
    if (parts.length > 1) {
        integral = parts[0];
        decimal = parts[1];
        // Cut down redundant decimal digits that are after the second.
        decimal = decimal.substr(0, 2);
    }
    else {
        integral = parts[0];
        decimal = "";
    }
    // Prepare the characters corresponding to the digits:
    digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
    radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
    bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
    decimals = new Array(CN_TEN_CENT, CN_CENT);
    // Start processing:
    outputCharacters = "";
    // Process integral part if it is larger than 0:
    if (Number(integral) > 0) {
        zeroCount = 0;
        for (i = 0; i < integral.length; i++) {
            p = integral.length - i - 1;
            d = integral.substr(i, 1);
            quotient = p / 4;
            modulus = p % 4;
            if (d == "0") {
                zeroCount++;
            }
            else {
                if (zeroCount > 0)
                {
                    outputCharacters += digits[0];
                }
                zeroCount = 0;
                outputCharacters += digits[Number(d)] + radices[modulus];
            }
            if (modulus == 0 && zeroCount < 4) {
                outputCharacters += bigRadices[quotient];
            }
        }
        outputCharacters += CN_DOLLAR;
    }
    // Process decimal part if there is:
    if (decimal != "") {
        for (i = 0; i < decimal.length; i++) {
            d = decimal.substr(i, 1);
            if (d != "0") {
                outputCharacters += digits[Number(d)] + decimals[i];
            }
        }
    }
    // Confirm and return the final output string:
    if (outputCharacters == "") {
        outputCharacters = CN_ZERO + CN_DOLLAR;
    }
    if (decimal == "") {
        outputCharacters += CN_INTEGER;
    }
    outputCharacters = CN_SYMBOL + outputCharacters;
    return outputCharacters;
}

/**
 * 格式化金额
 * @param s 金额数字
 * @param n 小数位位数
 * @returns {string} 12345.6格式化为12,345.60
 */
function formatMoney(s, n){
    n = n > 0 && n <= 20 ? n : 2;
    s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";//更改这里n数也可确定要保留的小数位
    var l = s.split(".")[0].split("").reverse(),
        r = s.split(".")[1];
    t = "";
    for(i = 0; i < l.length; i++ )
    {
        t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
    }
    return t.split("").reverse().join("") + "." + r;//保留2位小数  如果要改动 把substring 最后一位数改动就可
}
